Patent GB-690754-A (GB)
Title: Improvements in or relating to addressing and like series printing machines
Inventor: KERR ROBERT LEONARD
IPC: B41L47/58
Filed: 1950-09-05
Abstract: 690,754. Addressing-machines. ADREMA, Ltd. Aug. 22, 1951 [Sept. 5, 1950], No. 21859/50. Class 100(ii) The plates to be printed from in an addressing machine or like series printing machine are selected by electrical means controlled by signals, e.g. pips carried on the plates themselves, the means comprising a plug board having sockets any two of which may be connected together by a flexible connector and being arranged in pairs connected to contacts closed by the presence or absence of a pip in that particular position on the printing plates. Fig. 1 shows a plug board A adapted for use with printing plates having five possible positions for the signal pips (1-5). In each position are six pairs of sockets, sockets B, C and D being connected to normally open contacts and sockets E, F and G being connected to normally closed contacts. These contacts are closed and opened respectively when a sensing means is actuated by the signal pips of the plates. A number of supply sockets J are connected to one side of a source of electricity H. Sockets L (termed " positive sockets ") are connected through the contacts of a relay P to an electromaget N controlling the machine so that a plate will only be printed from if the magnet N is energized. Sockets K (termed " direct-positive sockets) are connected directly to the magnet N. Sockets M (termed " negative sockets ") are connected to the energizing coil Q of the relay P so that when a connection is made to sockets M the relay P is opened to prevent the connection from the sockets K causing energization of the magnet N. The other side of the magnet coil N is connected through a contact R closed once during every printing cycle to the other pole of the source H. The pairs of sockets are connected up by flexible connectors, e.g. as shown at S, T, U, V. W. X to select groups of plates for printing. Circuits made through normally open or normally closed contacts to " direct positive " sockets K cause printing or skipping respectively of the plates carrying signal pips corresponding to the positions of the sockets connected. The same result is achieved by circuits made to the " positive " sockets L unless a circuit is also made through the " negative " sockets M which causes energization of the coil Q and opening of the relay P. According to the invention at least one auxiliary or transitionary circuit is provided on the plug board as shown in Fig. 2. By this means selector circuits for classes of categories may be established between the supply sockets J and the sockets k, l, m of one transitionary circuit and between socket j and sockets k<SP>1</SP>, l<SP>1</SP>, m<SP>1</SP> of the second transitionary circuit and between sockets j<SP>1</SP> and sockets K, L, M. By the provision of two transitionary circuits, therefore, up to three selector circuits may be arranged in series. Where each transitionary circuit is made to select a particular class of categories, the connection of the transitionary circuits in series will provide for printing of those plates only, which are common to each class.